AS a Special Security Officer in a past life, one of the interview questions was about any foreign loyalties. When we had someone who claimed dual citizenship, we required that they formally renounce the other citizenship before we could process their clearance request. This was not just Israel....military families with foreign born spouses frequently had children with dual citizenship (Germany, England, etc). In that world, dual citizenship = questioned loyalty = no clearance. How do these retain their clearances?